EYE DISEASES : STRABISMUS FRIENDLY (STRABISMUS CONCOMITANS) - etiology, pathogenesis, symptoms and course of, recognition, prediction and prevention
Etiology. Hyperopia significant degree. Poor eyesight in one eye, congenital or acquired in early childhood; congenital absence of binocular vision (with good vision in both eyes). High myopia.
The pathogenesis. With hyperopia even when vision necessary accommodation, which is closely related to the convergence of the visual axes. Consequently, the child-hypermetropy forced to clear distance vision to accommodate, and at the same time and concertize, i.e. to mow. Consequently, the first temporary strabismus, always converging gradually to the 2 - 3rd year of life is permanent. If the cause of strabismus is not hyperopia, and others the reasons mentioned above, it develops due to the absence of harmonic balance muscles (heterophoria). With high myopia almost always get exotropia due to excessive work of the internal muscles and the lack of momentum to the accommodation.
Symptoms. Visual line of one eye is not directed at other eye fixed object. Squinting eye does all the movement in the same size as healthy, and the visual line it always evades fixed the other eye point to the same value. If you close healthy eyes with his hand and offer to fix the set before the eye of the subject (finger) from the squinting eye, then under the closing hand of a healthy eye will deviate in the same direction (towards the nose or the temple) and exactly the same amount, how much was earlier rejected by squinting.
For. Convergent strabismus (deviation of the nose) usually develops in early childhood and for the most part remains in one position, but sometimes decreases due to the growth of the orbit and the increase of the distance between the eyes. Divergent strabismus (deviation of the temple) develops at a later age, mostly in patients with myopia, and remains unchanged.
From strabismus due to paralysis of the eye muscles is characterized in that paralysis is absent eye movement in the direction of the paralyzed muscle. If you close healthy eyes with his hand and offer to record the subject's eye, the muscle which is paralyzed, healthy eye always deviates by an amount much greater than that which was rejected by the eyes of a paralyzed muscle. All these phenomena with concomitant strabismus are missing.
The appointment of children-hypermetropes relevant points for continuous wear.
The purpose of the spectacles, correcting the refraction of the eye after a thorough study of refraction using skiascopy under atropine. Worse vision in one eye lasting (several weeks) tying healthy eyes sometimes leads to vision improvement and correction of strabismus. The same purpose is pursued long vipiana best in the eyes of atropine to force the child to watch the worst eye. Exercises in viewing stereoscopic images to awaken the desire for binocular vision and to restore the lost with the fusion reflex. In a later age at considerable angles of deviation of the visual axes (not earlier than 12 - 17 years) surgical treatment.